how to install cortina in ubuntu

Cortina is  an open-source desktop wallpaper management application for GNOME.It runs as a tray application.From their project page-

The biggest selling point of cortina is the ability to rotate wallpapers on a timely basis. It strives to be as simple as possible and
fits in the rest of the GNOME desktop.

Found it out few days back;but there was no ppa available for ubuntu at that time.Though the project page contains .deb files for easy installation,but wanted to install it via synaptic.
Thankfully the developer now provided a repository.
To install,type the following in the terminal:

sudo apt-add-repository ppa:cs-sniffer/cortina
sudo apt-get update ; sudo apt-get install cortina

Screenshots of the programme: